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transpose
2 Answer(s)      5 years and 8 months ago
Posted in : Java Beginners

how to write transpose of a matrix a program....

August 16, 2011 at 1:21 PM

public class Transpose {

```public static void main(String[] args) {

// create N-by-N matrix
int N = Integer.parseInt(args[0]);
int[][] a = new int[N][N];
for (int i = 0; i < N; i++) {
for (int j = 0; j < N; j++) {
a[i][j] = N*i + j;
}
}

// print out initial matrix
System.out.println("Before");
System.out.println("------");
for (int i = 0; i < N; i++) {
for (int j = 0; j < N; j++) {
System.out.printf("%4d", a[i][j]);
}
System.out.println();
}

// transpose in-place
for (int i = 0; i < N; i++) {
for (int j = i+1; j < N; j++) {
int temp = a[i][j];
a[i][j] = a[j][i];
a[j][i] = temp;
}
}

// print out transposed matrix
System.out.println();
System.out.println("After");
System.out.println("------");
for (int i = 0; i < N; i++) {
for (int j = 0; j < N; j++) {
System.out.printf("%4d", a[i][j]);
}
System.out.println();
}

}
```

}

August 17, 2011 at 11:41 AM

```import java.util.*;

public class Transpose {
public static void main(String[] args) throws Exception {
int rows, cols;
int[][] matrix, tmatrix;
Scanner input = new Scanner(System.in);
System.out.print("Enter number of rows: ");
rows = input.nextInt();
System.out.print("Enter number of columns: ");
cols = input.nextInt();
matrix = new int[rows][cols];
tmatrix = new int[cols][rows];
System.out.println("Enter elements for Matrix");
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
matrix[i][j] = input.nextInt();
}
}
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
tmatrix[i][j] = matrix[j][i];
}
}
System.out.println("Matrix is:");
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
System.out.print(matrix[i][j] + " ");
}
System.out.println();
}
System.out.println("Its transpose is: ");
for (int i = 0; i < cols; i++) {
for (int j = 0; j < rows; j++) {
System.out.print(tmatrix[i][j] + " ");
}
System.out.println();
}
}
}
```

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